Charge separation in facet-engineered chalcogenide photocatalyst: a selective photocorrosion approach
writer：Li, NX (Li, Naixu)[ 1 ] ; Liu, MC (Liu, Maochang)[ 2 ] ; Zhou, ZH (Zhou, Zhaohui)[ 2 ] ; Zhou, JC (Z
keywords：VISIBLE-LIGHT; HYDROGEN-PRODUCTION; ARTIFICIAL PHOTOSYNTHESIS; SOLID-SOLUTION; CRYSTAL FACES; WATER; TIO2; ANATASE; COCATALYSTS; H-2
source：期刊
specific source：NANOSCALE
Issue time：2014年
Finding active sites for photocatalytic reduction and oxidation allows the mechanistic understanding of a given reaction, ensuring the rationaldesign and fabrication of an efficient photocatalyst. Herein, using well-shaped Cu2WS4 decahedra as model photocatalysts, we demonstrated that photoinduced oxidative etching could be considered as an indicationof the photooxidation reaction sites of chalcogenide photocatalyst as it only occurred on {101} facets of Cu2WS4 during photocatalytic hydrogen production. The photocatalytic reduction reaction, in contrast,was confined on its {001} facets. Based on this finding, the photocatalytic activity of Cu2WS4 decahedra could be further tailored bycontrolling the ratio of {001}/{101} facets. Thus, this work provides ageneral route to the determination of reactive sites on shaped chalcogenide photocatalysts.